Margin of safety results

Margin of safety results are displayed as follows:

• In tabular form in the Margin of Safety Results dialog box

• Individually in any annotations that you created for margin of safety calculations.

• Individually for a specific calculation in the calculation log.

Results table

In the Margin of Safety Results dialog box, you can refine the calculations that are displayed and how they are displayed in the Margin of Safety Results table. To do so, you have the following options:

• Filter the table

• Find items in the table

• Sort the table

• Hide a displayed column

• Fit the width of a column to the text in the column

• Freeze a column

• Control the columns that are displayed and the order in which they appearThe columns that you can display include columns for the inputs to the calculations. For example, if the method for a calculation is the Tresca plane stress method, you can display the values for the allowable Tresca equivalent stress, the in-plane normal stresses, and the in-plane shear stress that the software uses in the margin of safety calculation.

To access these options, in the Margin of Safety Results table, right-click the heading of the column that contains the data you want filter, sort, hide, and so on.

Refining the calculations that are displayed in the Margin of Safety Results table does not affect which annotations are displayed in the graphics window.

You can color code the calculations displayed in the Margin of Safety Results table with respect to margin of safety. When you do so, the leader lines of the annotations are color coded as well. The legend for the color code appears in the graphics window.

To apply color coding, select Show worst MS on 3D View.

Note:

The node and element IDs from which the software obtains the values for the margin of safety calculation are not included in the Margin of Safety Results table.

Distribution table

In the Margin of Safety Results dialog box, the distribution table displays the number of times each load case or method is used in a margin of safety calculation.

You can refine the display of calculations in the Margin of Safety Results table.

• You can restrict the color coding to calculations that are displayed in the Margin of Safety Results table and are currently selected in the distribution table. This capability is useful if you want to examine only the results for a specific load case or failure mode.To do so, select the Restricted to selected items in the active distribution table check box.

• When the Show worst MS on 3D View check box is selected, one or more load cases are currently selected in the distribution table, the Restricted to selected items in the active distribution table check box is selected, and annotations for calculations exist, you can hide annotations for calculations that do not include load cases or failure criteria that are currently selected in the distribution table.To do so, for load cases, select the Hide calculations corresponding to unselected Load Cases from 3D View check box. For methods, select the Hide calculations corresponding to unselected Failure mode from 3D View check box.

You can create a new load case set from a selection of results in the distribution table. Doing so allows you to iterate your solution for additional margin of safety solutions. For more information, see Create a load case set from margin of safety results.

Annotations

You create annotations when you create calculations. The annotations appear in the graphics window. After the calculation is solved, the margin of safety result for the calculation automatically appears in the annotation.

To hide an annotation, you can:

• In the Simulation Navigator, deselect the check box next to the calculation you want to hide.

• In the graphics window, right-click the annotation and choose Hide.

To display a hidden annotation, in the Simulation Navigator, select the check box next to the calculation you want to display.

Calculation log

You can view the results for a specific calculation in the calculation log. The calculation log also reports other information that is related to the margin of safety calculation such as the value the software uses in the margin of safety calculation and the load case set for the calculation, among others.

Invalid results

Margin of safety, MS, is defined as follows:

MS = \left( {\frac{{{P_f}}}{{{P_w}}}} \right) - 1

where Pf is the load at which failure initiates, and Pw is the corresponding working load.

For the margin of safety calculation to be valid, the algebraic signs of the numerator and denominator must be same. When the algebraic signs are the same, by definition the margin of safety is greater than -1. Thus, any margin of safety calculation that produces a value less than -1 is improperly formulated.

To inform you when such a situation occurs, any margin of safety value less than -1 is highlighted in yellow in the Margin of Safety Results table.

Note:

All of the built-in methods except the Generic allowable method perform checks to assure that the margin of safety calculation is properly formulated. If the calculation is improperly formulated, the software issues an error message. The Generic allowable method uses the absolute value of Pf / Pw in the margin of safety calculation, which assures that the margin of safety result is greater than -1.

Where do I find it?

Displaying results in a table

Application	Pre/Post
Prerequisite	An active margin of safety solution that is solved
Simulation Navigator	Right-click the margin of safety solution node→Display Results

Controlling the columns that are displayed and how they are ordered in the results table

Application	Pre/Post
Prerequisite	An active margin of safety solution that is solved
Simulation Navigator	Right-click the margin of safety solution node→Display Results
Location in dialog box	Right-click a column heading→Configure Columns

Displaying the calculation log

Application	Pre/Post
Prerequisite	An active margin of safety solution that is solved
Simulation Navigator	Expand the Calculations node→right-click the calculation→View log

How do I

Create a margin of safety solution

Learn more

Margin of safety overview

Margin of safety workflow

SOL 101 setup for margin of safety

Critical margin of safety expressions

Margin of safety reports

Terminating margin of safety solves

Quick links

Command reference

Pre/Post video examples

Bulk Entry Descriptions

Simcenter 3D tutorials

Browse Simcenter 3D help by product area

Margin of Safety methods documentation

Margin of safety results, Simcenter 3D 2021.1 Series

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